Try declaring the sum
variable as a double
(or float
):
double sum = 0.0;
Why? because in this line:
percentage = array[elements] / sum;
... You're performing a division between two integers, and all the decimals will be lost. You can verify that this is indeed the case, for example try this:
System.out.println(1/3); // it'll print 0 on the console
The solution to this problem is to have either one of the division's operands as a decimal number, by declaring as such their types (as I did above) or by performing a cast. Alternatively, this would work without changing sum
's type:
percentage = array[elements] / ((double)sum);